Why didn't my complete ESPN history copy over?

We can only import the data that we have available. ESPN doesn't make all historical data available but we are able to import your final standings.

If there's data from your ESPN league that you wish to preserve, you can take screenshots or copy/paste it and upload the files to a tool like Google Drive or Dropbox. The files can then be shared with league members and linked to on your Fleaflicker league's message board or commish note for future access.